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- Introduce portable sched_getcpu() api
- Support GCC's __target_clones__ feature
- Make fma() go faster on x86 in default mode
- Remove some asan checks from core libraries
- WinMain() now ensures $HOME and $USER are defined
This commit is contained in:
Justine Tunney 2024-02-01 03:39:46 -08:00
parent d5225a693b
commit 2ab9e9f7fd
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192 changed files with 2809 additions and 932 deletions
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49
third_party/libcxx/string vendored
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@ -702,34 +702,41 @@ private:
#ifdef _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
struct __long
{
pointer __data_;
struct __long {
pointer __data_;
size_type __size_;
size_type __cap_;
size_type __cap_ : sizeof(size_type) * CHAR_BIT - 1;
size_type __is_long_ : 1;
};
#ifdef _LIBCPP_BIG_ENDIAN
static const size_type __short_mask = 0x01;
static const size_type __long_mask = 0x1ul;
#else // _LIBCPP_BIG_ENDIAN
static const size_type __short_mask = 0x80;
static const size_type __long_mask = ~(size_type(~0) >> 1);
#endif // _LIBCPP_BIG_ENDIAN
enum { __min_cap = (sizeof(__long) - 1) / sizeof(value_type) > 2 ? (sizeof(__long) - 1) / sizeof(value_type) : 2 };
enum {__min_cap = (sizeof(__long) - 1)/sizeof(value_type) > 2 ?
(sizeof(__long) - 1)/sizeof(value_type) : 2};
struct __short
{
struct __short {
value_type __data_[__min_cap];
struct
: __padding<value_type>
{
unsigned char __size_;
};
unsigned char __padding_[sizeof(value_type) - 1];
unsigned char __size_ : 7;
unsigned char __is_long_ : 1;
};
// The __endian_factor is required because the field we use to store the size
// has one fewer bit than it would if it were not a bitfield.
//
// If the LSB is used to store the short-flag in the short string representation,
// we have to multiply the size by two when it is stored and divide it by two when
// it is loaded to make sure that we always store an even number. In the long string
// representation, we can ignore this because we can assume that we always allocate
// an even amount of value_types.
//
// If the MSB is used for the short-flag, the max_size() is numeric_limits<size_type>::max() / 2.
// This does not impact the short string representation, since we never need the MSB
// for representing the size of a short string anyway.
# ifdef _LIBCPP_BIG_ENDIAN
static const size_type __endian_factor = 2;
# else
static const size_type __endian_factor = 1;
# endif
#else
struct __long